Nope all your sparrows should be there. I currently have 3. The red one, a green one and the tumbler. However, having had a Ghallahorn nuked when I was kicked from a nightfall I'm wondering when Bungie are going to sort this crap out. It's not just an isolated incident either. People are loosing weapons and drops and so far Bungie have just remained silent, put their fingers in their ears and started going "na na na na na can't hear you!" or something equally stupid and annoying.